swh:1:snp:32555a3fd8878f019c2ebd6c964bc1edcaeff337
Tip revision: 418baf2c28f3473039f2f7377760bd8f6897ae18 authored by Linus Torvalds on 22 November 2020, 23:36:08 UTC
Linux 5.10-rc5
Linux 5.10-rc5
Tip revision: 418baf2
xen-stub.c
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* xen-stub.c - stub drivers to reserve space for Xen
*
* Copyright (C) 2012 Intel Corporation
* Author: Liu Jinsong <jinsong.liu@intel.com>
* Author: Jiang Yunhong <yunhong.jiang@intel.com>
*
* Copyright (C) 2012 Oracle Inc
* Author: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/export.h>
#include <linux/types.h>
#include <linux/acpi.h>
#include <xen/acpi.h>
#ifdef CONFIG_ACPI
/*--------------------------------------------
stub driver for Xen memory hotplug
--------------------------------------------*/
static const struct acpi_device_id memory_device_ids[] = {
{ACPI_MEMORY_DEVICE_HID, 0},
{"", 0},
};
static struct acpi_driver xen_stub_memory_device_driver = {
/* same name as native memory driver to block native loaded */
.name = "acpi_memhotplug",
.class = ACPI_MEMORY_DEVICE_CLASS,
.ids = memory_device_ids,
};
int xen_stub_memory_device_init(void)
{
if (!xen_initial_domain())
return -ENODEV;
/* just reserve space for Xen, block native driver loaded */
return acpi_bus_register_driver(&xen_stub_memory_device_driver);
}
EXPORT_SYMBOL_GPL(xen_stub_memory_device_init);
subsys_initcall(xen_stub_memory_device_init);
void xen_stub_memory_device_exit(void)
{
acpi_bus_unregister_driver(&xen_stub_memory_device_driver);
}
EXPORT_SYMBOL_GPL(xen_stub_memory_device_exit);
/*--------------------------------------------
stub driver for Xen cpu hotplug
--------------------------------------------*/
static const struct acpi_device_id processor_device_ids[] = {
{ACPI_PROCESSOR_OBJECT_HID, 0},
{ACPI_PROCESSOR_DEVICE_HID, 0},
{"", 0},
};
static struct acpi_driver xen_stub_processor_driver = {
/* same name as native processor driver to block native loaded */
.name = "processor",
.class = ACPI_PROCESSOR_CLASS,
.ids = processor_device_ids,
};
int xen_stub_processor_init(void)
{
if (!xen_initial_domain())
return -ENODEV;
/* just reserve space for Xen, block native driver loaded */
return acpi_bus_register_driver(&xen_stub_processor_driver);
}
EXPORT_SYMBOL_GPL(xen_stub_processor_init);
subsys_initcall(xen_stub_processor_init);
void xen_stub_processor_exit(void)
{
acpi_bus_unregister_driver(&xen_stub_processor_driver);
}
EXPORT_SYMBOL_GPL(xen_stub_processor_exit);
#endif